回顾数据结构（Java版）——实现一个间的的数组栈

深藏阁楼爱情的钟 2023-06-06 03:58 79阅读 0赞

package com.wrial.stack;
    /*
     * @Author  Wrial
     * @Date Created in 8:48 2019/10/10
     * @Description 数组实现栈
     */
    
    public class ArrayStackTest {
    
        public static void main(String[] args) {
            Stack<Integer> arrayStack = new ArrayStack<>();
            System.out.println("栈空：" + arrayStack.isEmpty());
            System.out.println("栈满" + arrayStack.isFull());
            arrayStack.push(1);
            arrayStack.push(2);
            arrayStack.showAll();
            System.out.println("______________________");
            System.out.println("出栈" + arrayStack.pop());
            arrayStack.showAll();
            System.out.println("栈空：" + arrayStack.isEmpty());
            System.out.println("栈满" + arrayStack.isFull());
        }
    }
    
    interface Stack<T> {
        /**
         * 栈是否为空
         */
        boolean isEmpty();
    
        /**
         * data元素入栈
         */
        void push(T data);
    
        /**
         * 返回栈顶元素,未出栈
         */
        T peek();
    
        /**
         * 出栈,返回栈顶元素,同时从栈中移除该元素
         */
        T pop();
    
        /**
         * 是否栈满
         */
        boolean isFull();
    
        /**
         * 遍历栈
         */
        void showAll();
    }
    
    class ArrayStack<T> implements Stack {
        private T[] array;
        private int capacity;
        private int top = -1;  //栈顶初始化为-1
    
        ArrayStack(int capacity) {
            this.capacity = capacity;
            array = (T[]) new Object[capacity];
        }
    
        ArrayStack() {
            this.capacity = 16;
            array = (T[]) new Object[16];
        }
    
    
        @Override
        public boolean isEmpty() {
            return top == -1;
        }
    
        @Override
        public void push(Object data) {
            if (isFull()) {
                System.out.println("栈满");
                return;
            }
            top++;
            array[top] = (T) data;
            System.out.println("入栈成功" + array[top]);
    
        }
    
        @Override
        public Object peek() {
            return array[top];
        }
    
        public T pop() {
            if (isEmpty()) {
                System.out.println("栈空");
                return null;
            } else {
                T value = array[top];
                top--;
                return value;
            }
        }
    
        @Override
        public boolean isFull() {
            return top == capacity;
        }
    
        //记得遍历栈的时候是从上往下遍历
        @Override
        public void showAll() {
            for (int i = top; i >= 0; i--) {
                System.out.printf("%d\t", array[i]);
            }
        }
    
    
    }

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